Ski mask



FIG. 1 is a perspective view of the ski mask showing my new design;

FIG. 2 is a reduced top plan view thereof;

FIG. 3 is a reduced side elevational view thereof;

FIG. 4 is a reduced rear elevational view thereof; and,

FIG. 5 is a reduced bottom plan view thereof. 

The ornamental design for a ski mask, as shown and described. 